AC circuits

Current that continually reverse its direction

• Direct current

• Alternating current

• Pulsating direct current

• Pulsating alternating current

Which of the following effects are generally less for an alternating current than for a direct current?

• Heating effects

• Chemical effects

• Magnetic effects

• Impedance

When the sole purpose of ac is to produce heat, the selection of conductor is based on ___ value of the current

• Average

• Instantaneous

• RMS

• Peak

Root-mean-square is also called the ___ voltage

• Average

• Peak

• Effective

• Maximum

If an AC sine wave reaches a peak voltage of 100, what is the effective root-mean-square voltage?

• 57.7 Volts

• 141.4 Volts

• 86.6 Volts

• 70.7 Volts

The value of for factor for a pure sine wave is?

• 1.414

• 0.707

• 0.637

• 1.11

What is the average current during the half cycle given the instantaneous maximum value of 30 A?

• 12.73 A

• 6.37 A

• 19.09 A

• 9.55 A

The current in a series circuit of R = 10 ohm and L = 60 mH lags the applied voltage by 80 degrees. What is the source frequency in HZ?

• 144.3

• 163.5

• 150.4

• 174.6

The net reactance in a series RLC circuit is

• X_L

• X_C

• X_C + X_L

• X_L - X_C

For an RL circuit, the power factor cannot be less than ___ and greater than ___

• 0,1

• 1,0

• 0,-1

• -1,0